Mortgage Interest Deduction Limit Guide for Homeowner Tax Benefits (2026)
Calculate mortgage interest deduction limits: acquisition debt vs home equity debt, $750K cap, itemized deduction requirements, and AMT impact.
Summary
Mortgage interest deduction is capped at $750K debt. This guide explains acquisition debt, home equity use, and itemized deduction requirements.
Key Steps
- 1Identify acquisition debt: mortgage to buy, build, or improve primary/second home.
- 2Check debt limit: $750K maximum for deduction (pre-2018 loans grandfathered at $1M).
- 3Track home equity use: deduction allowed only for home improvement, not personal use.
- 4Itemize deduction: mortgage interest only deductible if itemizing beats standard deduction.
- 5Consider AMT impact: mortgage interest may not reduce AMT liability.